Cosmological Evolution Across Phantom Crossing and the Nature of the Horizon
arXiv:1006.0881 · doi:10.1007/s10509-011-0704-z
Abstract
In standard cosmology, with the evolution of the universe, the matter density and thermodynamic pressure gradually decreases. Also in course of evolution, the matter in the universe obeys (or violates) some restrictions or energy conditions. If the matter distribution obeys strong energy condition (SEC), the universe is in a decelerating phase while violation of SEC indicates an accelerated expansion of the universe. In the period of accelerated expansion the matter may be either of quintessence nature or of phantom nature depending on the fulfilment of the weak energy condition (WEC) or violation of it. As recent observational evidences demand that the universe is going through an accelerated expansion so mater should be either quintessence or phantom in nature. In the present work we study the evolution of the universe through the phantom barrier (i.e. the dividing line between the quintessence and phantom era) and examine how apparent and event horizon change across the barrier. Finally, we investigate the possibility of occurrence of any singularity in phantom era.
arXiv comment7 pages and 4 figures
References in corpus (41)
- Dynamics of dark energy
- Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
- Cosmological parameters from SDSS and WMAP
- A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
- Cosmological Constant - the Weight of the Vacuum
- Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
- Cosmology and the Fate of Dilatation Symmetry
- Quintessence, Cosmic Coincidence, and the Cosmological Constant
- Is Cosmic Speed-Up Due to New Gravitational Physics?
- Phantom Energy and Cosmic Doomsday
- Modified gravity with negative and positive powers of the curvature: unification of the inflation and of the cosmic acceleration
- Curvature Quintessence
- Dark Energy Constraints from the Cosmic Age and Supernova
- Late-time cosmology in (phantom) scalar-tensor theory: dark energy and the cosmic speed-up
- Quantum deSitter cosmology and phantom matter
- Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
- Unifying phantom inflation with late-time acceleration: scalar phantom-non-phantom transition model and generalized holographic dark energy
- Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
- First Law of Thermodynamics and Friedmann Equations of Friedmann-Robertson-Walker Universe
- Cosmological Evolution of a Quintom Model of Dark Energy
- Inhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier
- A classification of scalar field potentials with cosmological scaling solutions
- Sudden Future Singularities
- Quantum effects can render w<-1 on cosmological scales
- Friedmann Equations of FRW Universe in Scalar-tensor Gravity, f(R) Gravity and First Law of Thermodynamics
- Unified phantom cosmology: inflation, dark energy and dark matter under the same standard
- Oscillating Quintom and the Recurrent Universe
- Dark Energy and Dark Gravity
- On the possible running of the cosmological "constant"
- Quintom models with an equation of state crossing -1
- Generalized Second Law of Thermodynamics in Quintom Dominated Universe
- Effective equation of state for dark energy: mimicking quintessence and phantom energy through a variable Lambda
- A Single Scalar Field Model of Dark Energy with Equation of State Crossing -1
- Coupled oscillators as models of quintom dark energy
- Parametrizations of the Dark Energy Density and Scalar Potentials
- Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum)
- Quintom Cosmology with General Potentials
- Shape invariance method for quintom model in the bent brane background
- Dynamical dark energy or variable cosmological parameters?
- Phantom evolution in power-law potentials
- Validity of the Generalized Second Law of Thermodynamics of the Universe Bounded by the Event Horizon in Holographic Dark Energy Model